Method for surface mining with dragline and blast casting

Details Method for surface mining with dragline and blast casting Method for surface mining with dragline and blast casting

1991-11-25

1992-08-25

Nelson, Peter A.

Ammunition and explosives

Blasting

Terrain clearance

102312, 102313, 299 13, F42D 300

Patent

active

051409070

ABSTRACT:
Coal and other mineral seams are uncovered to a desired width by blast casting a portion of the overburden above the seam into an adjacent spoil pit, followed by excavation of a keycut between unblasted overburden and a plug portion of the overburden remaining above the seam and adjacent to the spoil pit. The excavated material forms a temporary spoil pile adjacent to the plug portion and covering the blast cast overburden. The plug portion and the temporary spoil pile are reshaped to form a support pad for the excavating apparatus which is moved onto the pad and then excavates the plug portion and reshaped temporary spoil pile to form a spoil pile laterally spaced from the pad so as to uncover the remaining uncovered portions of the seam.

REFERENCES:
patent: 1872016 (1932-08-01), Sherwood et al.
patent: 4135762 (1979-01-01), Biawcale
patent: 4522448 (1985-06-01), Nitzberg
patent: 4545622 (1985-10-01), Yang
patent: 4913233 (1990-04-01), Fitzgibbon, Jr.
patent: 4966077 (1990-10-01), Halliday et al.

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